2 * Copyright (C) 2007 Google, Inc.
3 * Copyright (C) 2011 Intel, Inc.
4 * Copyright (C) 2013 Intel, Inc.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/irq.h>
21 #include <linux/platform_device.h>
22 #include <linux/slab.h>
25 #define PDEV_BUS_OP_DONE (0x00)
26 #define PDEV_BUS_OP_REMOVE_DEV (0x04)
27 #define PDEV_BUS_OP_ADD_DEV (0x08)
29 #define PDEV_BUS_OP_INIT (0x00)
31 #define PDEV_BUS_OP (0x00)
32 #define PDEV_BUS_GET_NAME (0x04)
33 #define PDEV_BUS_NAME_LEN (0x08)
34 #define PDEV_BUS_ID (0x0c)
35 #define PDEV_BUS_IO_BASE (0x10)
36 #define PDEV_BUS_IO_SIZE (0x14)
37 #define PDEV_BUS_IRQ (0x18)
38 #define PDEV_BUS_IRQ_COUNT (0x1c)
39 #define PDEV_BUS_GET_NAME_HIGH (0x20)
42 struct list_head list;
43 struct platform_device pdev;
44 struct resource resources[0];
47 static void goldfish_pdev_worker(struct work_struct *work);
49 static void __iomem *pdev_bus_base;
50 static unsigned long pdev_bus_addr;
51 static unsigned long pdev_bus_len;
52 static u32 pdev_bus_irq;
53 static LIST_HEAD(pdev_bus_new_devices);
54 static LIST_HEAD(pdev_bus_registered_devices);
55 static LIST_HEAD(pdev_bus_removed_devices);
56 static DECLARE_WORK(pdev_bus_worker, goldfish_pdev_worker);
59 static void goldfish_pdev_worker(struct work_struct *work)
62 struct pdev_bus_dev *pos, *n;
64 list_for_each_entry_safe(pos, n, &pdev_bus_removed_devices, list) {
66 platform_device_unregister(&pos->pdev);
69 list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) {
71 ret = platform_device_register(&pos->pdev);
73 pr_err("goldfish_pdev_worker failed to register device, %s\n",
75 list_add_tail(&pos->list, &pdev_bus_registered_devices);
79 static void goldfish_pdev_remove(void)
81 struct pdev_bus_dev *pos, *n;
84 base = readl(pdev_bus_base + PDEV_BUS_IO_BASE);
86 list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) {
87 if (pos->resources[0].start == base) {
93 list_for_each_entry_safe(pos, n, &pdev_bus_registered_devices, list) {
94 if (pos->resources[0].start == base) {
96 list_add_tail(&pos->list, &pdev_bus_removed_devices);
97 schedule_work(&pdev_bus_worker);
101 pr_err("goldfish_pdev_remove could not find device at %x\n", base);
104 static int goldfish_new_pdev(void)
106 struct pdev_bus_dev *dev;
108 u32 irq = -1, irq_count;
109 int resource_count = 2;
113 base = readl(pdev_bus_base + PDEV_BUS_IO_BASE);
115 irq_count = readl(pdev_bus_base + PDEV_BUS_IRQ_COUNT);
116 name_len = readl(pdev_bus_base + PDEV_BUS_NAME_LEN);
120 dev = kzalloc(sizeof(*dev) +
121 sizeof(struct resource) * resource_count +
122 name_len + 1 + sizeof(*dev->pdev.dev.dma_mask), GFP_ATOMIC);
126 dev->pdev.num_resources = resource_count;
127 dev->pdev.resource = (struct resource *)(dev + 1);
128 dev->pdev.name = name = (char *)(dev->pdev.resource + resource_count);
129 dev->pdev.dev.coherent_dma_mask = ~0;
130 dev->pdev.dev.dma_mask = (void *)(dev->pdev.name + name_len + 1);
131 *dev->pdev.dev.dma_mask = ~0;
134 writel((u32)((u64)name>>32), pdev_bus_base + PDEV_BUS_GET_NAME_HIGH);
136 writel((u32)(unsigned long)name, pdev_bus_base + PDEV_BUS_GET_NAME);
137 name[name_len] = '\0';
138 dev->pdev.id = readl(pdev_bus_base + PDEV_BUS_ID);
139 dev->pdev.resource[0].start = base;
140 dev->pdev.resource[0].end = base +
141 readl(pdev_bus_base + PDEV_BUS_IO_SIZE) - 1;
142 dev->pdev.resource[0].flags = IORESOURCE_MEM;
144 irq = readl(pdev_bus_base + PDEV_BUS_IRQ);
145 dev->pdev.resource[1].start = irq;
146 dev->pdev.resource[1].end = irq + irq_count - 1;
147 dev->pdev.resource[1].flags = IORESOURCE_IRQ;
150 pr_debug("goldfish_new_pdev %s at %x irq %d\n", name, base, irq);
151 list_add_tail(&dev->list, &pdev_bus_new_devices);
152 schedule_work(&pdev_bus_worker);
157 static irqreturn_t goldfish_pdev_bus_interrupt(int irq, void *dev_id)
159 irqreturn_t ret = IRQ_NONE;
161 u32 op = readl(pdev_bus_base + PDEV_BUS_OP);
163 case PDEV_BUS_OP_DONE:
166 case PDEV_BUS_OP_REMOVE_DEV:
167 goldfish_pdev_remove();
170 case PDEV_BUS_OP_ADD_DEV:
179 static int goldfish_pdev_bus_probe(struct platform_device *pdev)
184 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
188 pdev_bus_addr = r->start;
189 pdev_bus_len = resource_size(r);
191 pdev_bus_base = ioremap(pdev_bus_addr, pdev_bus_len);
192 if (pdev_bus_base == NULL) {
194 dev_err(&pdev->dev, "unable to map Goldfish MMIO.\n");
198 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
204 pdev_bus_irq = r->start;
206 ret = request_irq(pdev_bus_irq, goldfish_pdev_bus_interrupt,
207 IRQF_SHARED, "goldfish_pdev_bus", pdev);
209 dev_err(&pdev->dev, "unable to request Goldfish IRQ\n");
213 writel(PDEV_BUS_OP_INIT, pdev_bus_base + PDEV_BUS_OP);
217 iounmap(pdev_bus_base);
219 release_mem_region(pdev_bus_addr, pdev_bus_len);
223 static int goldfish_pdev_bus_remove(struct platform_device *pdev)
225 iounmap(pdev_bus_base);
226 free_irq(pdev_bus_irq, pdev);
227 release_mem_region(pdev_bus_addr, pdev_bus_len);
231 static struct platform_driver goldfish_pdev_bus_driver = {
232 .probe = goldfish_pdev_bus_probe,
233 .remove = goldfish_pdev_bus_remove,
235 .name = "goldfish_pdev_bus"
239 module_platform_driver(goldfish_pdev_bus_driver);